This text comes from The Book of Scottish Song, edited by Alexander Whitelaw, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Go, go, go,
Go to Berwick, Johnnie;
Thou shalt have the horse,
And I shall have the poney.
Go to Berwick, Johnnie;
Bring her frae the Border;
Yon sweet bonnie lassie,
Let her ga'e nae farther.
English loons will twine ye
O' the lovely treasure;
But we'll let them ken,
A sword wi' them we'll measure.
Go to Berwick, Johnnie,
And regain your honour;
Drive them ower the Tweed,
And show our Scottish banner.
I am Rob the king,
And ye are Jock, my brither;
But, before we lose her,
We'll a' there thegither.